﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 大小写转换
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("请输入字母：");
            char ch= Convert.ToChar(Console.ReadLine());
            Console.WriteLine("小写:"+Char.ToLower(ch));
            Console.WriteLine("小写:" + Char.ToUpper(ch));
            Console.ReadLine();
        }
            
    }

}
